Some months ago I posted asking why DRI wasn't working on my system with
a Rage 128 PF/PRO AGP 4x TMDS (as reported by lspci) card. Everything
looked fine.
Just now I found this information at
https://listman.redhat.com/pipermail/xfree86-list/2001q3/000074.html:
>It is critically important to everyone using DRI to set it up
>properly for their hardware. This means knowing that some
>hardware such as the Voodoo3 and Banshee *ONLY* has hardware
>support at 16 bit depth. So 24bpp is unsupported in hardware
>completely.
and
>For DRI to work properly, it requires a lot of video RAM. The
>general ballpark is 4 times the amount of RAM that your 2D
>resolution is using. So take your x res and y res, multiply
>them, then multiply that by the number of bytes per pixel
>(2=16bpp,4=24/32bpp). That gives you your 2D RAM usage. On top
>of that, X needs RAM for mouse pointers, and other pixmaps,
>etc... If this total is more than 1/4 of your video RAM, it is
>possible that DRI will either not start, or more likely, it will
>start, and will eventually hang your machine.
>
>Of course, this is all general advice based on a *LOT* of
>experimentation, advice of the XFree86 and DRI project members,
>and also user feedback and bug reports.
So I dropped my res down from 1600x1200x24 to 1280x1024x24, and sure
enough, that got DRI working for me. So it looks like if I want to have
the higher res with DRI, I'm gonna have to up my video RAM. Still, it's
great to have finally found the solution.
Thanks for everyone's input!
Kent
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